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Hi,
Ive a 4 wire telephone leased line interface..2 wires for Tx & 2 wires for Rx.
Over this link commands are transmitted and received as frequency tones for analog communication.
I need an isolation transformer to interface my circuitry towards it
I hope to convert the signal from line side to unbalanced on the board side using a transformer. But Im not sure how to select the transformer properly.
The following are some transmitter side parameters
RL 20dB
LCL 300-600Hz 40dB
600-3400Hz 46dB
Nominal output impedance 600Ohm
Output level range -30 to +12dBm
BW 300Hz-4000Hz
Isolation 1500V
Can u please help me to select a proper device?
Also while converting to unbalanced state on the board side, ive seen a circuit with a parallel resistor to ground on the board side in a schematics,
Can u plz tell me how to design properly the resistor value and if the impedance need to be maintained at the board level tracks as 600Ohms, like in RF PCB s as 50Ohm tracks??
Also there exists a case where multiple such units are used ..So then there need to be a 0 Ohm point (Tx)and as well as a 10kOhm position (Rx) .can u please advice me what to do in such cases?
Ive a 4 wire telephone leased line interface..2 wires for Tx & 2 wires for Rx.
Over this link commands are transmitted and received as frequency tones for analog communication.
I need an isolation transformer to interface my circuitry towards it
I hope to convert the signal from line side to unbalanced on the board side using a transformer. But Im not sure how to select the transformer properly.
The following are some transmitter side parameters
RL 20dB
LCL 300-600Hz 40dB
600-3400Hz 46dB
Nominal output impedance 600Ohm
Output level range -30 to +12dBm
BW 300Hz-4000Hz
Isolation 1500V
Can u please help me to select a proper device?
Also while converting to unbalanced state on the board side, ive seen a circuit with a parallel resistor to ground on the board side in a schematics,
Can u plz tell me how to design properly the resistor value and if the impedance need to be maintained at the board level tracks as 600Ohms, like in RF PCB s as 50Ohm tracks??
Also there exists a case where multiple such units are used ..So then there need to be a 0 Ohm point (Tx)and as well as a 10kOhm position (Rx) .can u please advice me what to do in such cases?
